Adding a new prog for VmHostSlice. A slice controls the allocation of CPUs and memory to one or more VMs. When created and associated with a VmHost, it creates a SystemCtl slice object (and underlying cgroup) on the host. It takes as an argument a set of CPUs to be affinitized to the group and an amount of memory to keep track of.
Also adding support for availability monitoring, following the standard pattern for ./bin/monitor script.
The VmHostSlice checks for three conditions:
- if the slice systemd unit is available
- if the allowed cpus is set to what is configured
- if the slice partition type is 'root' which indicates exclusive cpuset
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